Running toy

ABSTRACT

A running toy having: a direct current motor for steering which is remote controlled; and a steering arm to change a direction of a wheel, the steering arm being operated from side to side with respect to a vehicle body by a power of the direct current motor for steering, wherein a rack tooth is formed on the steering arm, the direct current motor for steering is allowed to perform a normal rotation and a reverse rotation, and a pinion gear which meshes the rack tooth is attached to a shaft of the direct current motor for steering via a centrifugal clutch.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a running toy comprising a steeringmechanism which is easy to assemble and causes a little powertransmission loss.

2. Description of the Related Art

Conventionally, as a steering mechanism of a running toy, there has beenknown one in which a power of a direct current motor for steering istransmitted through a clutch mechanism, motor pinion gears, crown gears,idle gears, sector wheels, an operation rod, and an operation member toactuate a steering arm from side to side with respect to a vehicle body(for example, refer to JP-Jitsukaihei-1-159893).

However, in the above conventional technique, the structure is such thatthe motor power is transmitted to the steering arm through manyelements. Thus, there have been problems such as that the assembly ofthe elements is complicated and the power transmission loss is large.

SUMMARY OF THE INVENTION

The present invention has been achieved to solve the problem, and anobject of the present invention is to provide a running toy comprising asteering mechanism which is easy to assemble and causes a little powertransmission loss.

In accordance with the first aspect of the present invention, therunning toy comprises:

a direct current motor for steering which is remote controlled; and

a steering arm to change a direction of a wheel, the steering arm beingoperated from side to side with respect to a vehicle body by a power ofthe direct current motor for steering,

wherein a rack tooth is formed on the steering arm, the direct currentmotor for steering is allowed to perform a normal rotation and a reverserotation, and a pinion gear which meshes the rack tooth is attached to ashaft of the direct current motor for steering via a centrifugal clutch.

Accordingly, since the power of the DC motor for steering is transmittedvia the clutch mechanism and the pinion and rack mechanism, the numberof the elements can be reduced in comparison with the above conventionaltechnique. Consequently, the assembly of the elements becomes extremelyeasy. Moreover, the power transmission loss can be reduced by thereduced number of the elements, enabling to perform steering with lowpower.

Preferably, the wheel and the direct current motor for steering areprovided at a position in front of a position of the steering arm in thevehicle body.

Accordingly, since the steering wheel and the DC motor for steering areprovided at a position in front of a position of the steering arm of thevehicle body, grounding property of the steering wheel can be improvedby the weight of the DC motor for steering, enabling to stably performsteering.

Preferably, a spring to return the steering arm to a neutral position ina lateral direction of the vehicle body in a state where the directcurrent motor for steering is not operated, is provided.

Accordingly, since the steering arm is returned to a neutral position inthe lateral direction of the vehicle body in the state where the DCmotor for steering is not operated, the running toy can go straightahead, or turn right or left depending upon the operating state of theDC motor for steering.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from thedetailed description given hereinafter and the accompanying drawingswhich are given by way of illustration only, and thus are not intendedas a definition of the limits of the present invention, and wherein;

FIG. 1 is a plan view showing a straight ahead state of a running toyaccording to the embodiment of the present invention;

FIG. 2 is a plan view showing a left turn state of the running toyaccording to the embodiment of the present invention;

FIG. 3 is a plan view showing a state where steering wheels of therunning toy according to the embodiment of the present invention weremoved forward and adjusted;

FIG. 4 is a broken perspective view of a front wheel support mechanismto support a left front wheel;

FIG. 5 is a front view of the running toy;

FIG. 6 is a plan view of a main portion showing an engagement state of asuspension member and a wheel support;

FIG. 7 is an explanation view showing a position adjustment of thesuspension member;

FIGS. 8A and 8B are explanation views showing a direct current motor forsteering and a clutch mechanism;

FIG. 9 is a perspective view showing a direct current motor for runningand a running mechanism:

FIG. 10 is a plan view showing the running mechanism;

FIG. 11 is a circuit diagram showing a drive circuit; and

FIG. 12 is a circuit diagram showing a power switch.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(Whole Structure of the Embodiment of the Present Invention)

FIGS. 1 to 3 are plan views of a running toy 100 of the embodiment ofthe present invention, wherein FIG. 1 shows a straight ahead state, FIG.2 shows a left turn state, and FIG. 3 shows a state where steeringwheels are moved forward and adjusted. In the explanation below, a backand forth direction of the running toy to go straight ahead is definedas a Y axis direction, a right and left direction is defined as an Xaxis direction, and a vertical direction is defined as a Z axisdirection. These are at right angles with one another.

As shown in FIGS. 1 to 3, the running toy 100 comprises right and leftrear wheels 21R, 21L as a drive wheel, right and left front wheels 22R,22L as a steering wheel, front wheel support mechanisms 30R, 30L tosupport the front wheels 22R, 22L, respectively, a steering mechanism 60to perform steering of each of the front wheels 22R, 22L, a runningmechanism 80 to give running torque to each of the rear wheels 21R, 21L,a motor drive circuit to drive a direct current motor for running 4 as adrive source of the running mechanism 80 and a direct current motor forsteering 13 as a drive source of the steering mechanism 60, a controlcircuit of the motor drive circuit, and a vehicle body 90 to store andhold each of the above components.

(Front Wheel Support Mechanism)

FIG. 4 is a broken perspective view of the front wheel support mechanism30L to support the left front wheel 22L. The front wheel supportmechanism 30L will be explained based on FIGS. 1 to 4. The front wheelsupport mechanism 30R of the right front wheel 22R is arranged to havemirror symmetry of the front wheel support mechanism 30L with respect toa Y-Z plane, so that the explanation thereof is omitted here. Eachstructure of the front wheel support mechanism 30R corresponding to thatof the front wheel support mechanism 30L to be explained below isappropriately described by changing “L” of the reference numeral of eachstructure of the front wheel support mechanism 30L to “R”. The frontwheel support mechanisms 30R, 30L are provided at the right and leftside surfaces of the vehicle body 90, respectively.

The front wheel support mechanism 30L comprises a steering rotating body32L to rotatably support the front wheel 22L through a rotary shaft 31L,a wheel support 33L to rotatably support the steering rotating body 32Laround a direction perpendicular to the rotary shaft 31L as a center,rotation support portions 35L, 36L to pivotally support the wheelsupport 33L by a support shaft 34L at the lower portion of the left sidesurface of the vehicle body 90, a spacer 37L to hold the wheel support33L to a predetermined position along the support shaft 34L, asuspension member 38L as a buffer to absorb vibration to the vehiclebody 90 from the front wheel 22L, and a suspension holding portion 39Lto hold the suspension member 38L at the vehicle body 90 side.

The above front wheel 22L is rotatable around the rotary shaft 31Lpositioned at the center thereof, and the rotary shaft 31L is held bythe steering rotating body 32L.

The steering rotating body 32L has an approximately cylindrical shape,and holds the rotary shaft 31L to be perpendicular to a center line Cdirection (vertical direction in FIG. 4) at the middle in the centerline C direction of the cylinder. A round shaped projection 32Laprojecting along the center line C direction is formed on each of theboth end portions of the steering rotating body 32L in the center line Cdirection (the projection at the lower side is not shown), and thesteering rotating body 32L is supported by the wheel support 33L via theround shaped projections 32La. Each projection 32La has a round shape,so that the steering rotating body 32L can rotate around the center lineC direction as a center with respect to the wheel support 33L.

Further, the steering rotating body 32L comprises a driven arm portion32Lb which extends in a radial direction of the cylinder at the upperend portion thereof. A round bar like engaging protrusion 32Lc isprovided to be fixed at the tip portion of the driven arm portion 32Lbto be parallel to the center line C direction. The engaging protrusion32Lc is pressed by a steering arm 69 of the steering mechanism 60 to bedescribed later in either direction along the X axis direction whensteering. Thereby, the steering rotating body 32L is rotated withrespect to the wheel support 33L, and the running direction of the frontwheel 22L is changed, so that the steering of the running toy 100 isperformed. The steering arm 69 is adapted to perform steering of theright and left steering rotating bodies 32R, 32L at the same time in thesame direction with the same displacement.

The steering arm 69 of the steering mechanism 60 will be explainedbeforehand. The steering arm 69 comprises a slide flat portion 69 awhich is supported by a guide groove (not shown) provided in the vehiclebody 90 to perform a reciprocating movement along the X axis direction,driving arms 69Rb, 69Lb each of which extends in a longitudinaldirection from one of the both ends of the slide flat portion 69 a inthe longitudinal direction and bends perpendicularly in the middle, andring-shaped portions 69Rc, 69Lc each having a long hole provided at thetip portion of each of the driving arms 69Rb, 69Lb.

The slide flat portion 69 a has a long plate-like shape, and issupported by the not shown guide groove of the vehicle body 90 to beslidably movable in the X axis direction in a state where the flat platesurface thereof is parallel to the X-Z plane.

The slide flat portion 69 a is provided with a long hole in the middleof the flat plate surface along the longitudinal direction, and a racktooth 69 d is formed along the longitudinal direction at the edge of thelower side of the long hole. The rack tooth 69 d meshes a pinion gear 64driven to rotate by the DC motor for steering 13 through a clutchmechanism 63, so that the steering arm 69 is moved in either directionalong the X axis direction by converting motor torque to the power tomove forward.

Each of the driving arms 69Rb, 69Lb is provided to extend in thelongitudinal direction from one of the both end portions of the slideflat portion 69 a, and bends in the middle in a direction perpendicularto the longitudinal direction. The bending direction is a directionwhich is perpendicular to the flat plate surface of the slide flatportion 69 a. That is, when the slide flat portion 69 a of the steeringarm 69 is supported by the vehicle body 90 in a state to be along theX-Z plane, each of the driving arms 69Rb, 69Lb becomes a state where thetip portion thereof is along the Y axis direction.

Each of the ring-shaped portions 69Rc, 69Lc has a long hole along thetip portion of each of the driving arms 69Rb, 69Lb. That is, when theslide flat portion 69 a of the steering arm 69 is supported by thevehicle body 90 in a state to be along the X-Z plane, each long hole ofthe ring-shaped portions 69Rc, 69Lc becomes a state where the tipportion thereof is along the Y axis direction. Each of the engagingprotrusions 32Rc, 32Lc of the steering rotating bodies 32R, 32L isinserted into the long hole of each of the ring-shaped portions 69Rc,69Lc. Each of the engaging protrusions 32Rc, 32Lc may incline in the Xaxis direction (to be described later), so that the width of the longhole of each of the ring-shaped portions 69Rc, 69Lc in the short axisdirection is set to be slightly larger than the diameter of the engagingprotrusions 32Rc, 32Lc. The positions of the front wheels 22R, 22L, andthe steering rotating bodies 32R, 32L can be adjusted along the Y axisdirection together with the wheel supports 33R, 33L (to be describedlater), so that the length of the long hole of each of the ring-shapedportions 69Rc, 69Lc in the long axis direction is set so that the amountof the position adjustment in the Y axis direction can be covered (referto FIG. 3).

FIG. 2 shows a state where steering is performed by the steering arm 69.The steering arm 69 is moved in either direction in the X axis directionby the DC motor for steering 13, thus the steering rotating bodies 32R,32L are rotated via the driven arm portions 32Rb, 32Lb from the drivingarms 69Rb, 69Lb, respectively, thereby steering the front wheels 22R,22L in the same direction. For example, when the steering arm 69 ismoved to right, the front wheel 22R, 22L are steered to turn left, andwhen the steering arm 69 is moved to left, the front wheels 22R, 22L aresteered to turn right.

A return spring (not shown) to return to the straight ahead position todirect the front wheels 22R, 22L to the straight ahead direction, and acontrol knob (not shown) to control the straight ahead position returnedby the return spring are both provided at the steering arm 69 in thevehicle body. Thus, when the steering control to the DC motor forsteering 13 is released, it is possible to automatically return to thestraight ahead running state.

Next, the wheel support 33L will be explained. The wheel support 33Lsupports the steering rotating body 32L to be rotatable around thecenter line C direction as a center. The wheel support 33L comprises atop plate 33La and a bottom plate 33Lb facing the both end portions ofthe steering rotating body 32L in the C direction, and a long back plate33Lc connecting the top plate 33La and the bottom plate 33Lb, which areintegrally formed to have an approximately C shape as a whole. That is,the top plate 33La and the bottom plate 33Lb are provided to extend inthe same direction which is perpendicular to the back plate 33Lc. Eachof the top plate 33La and the bottom plate 33Lb is provided with areceiving hole (not shown) to receive the projection 32La provided oneach of the both ends of the steering rotating body 32L, so that thewheel support 33L supports the steering rotating body 32L to berotatable.

There is provided an engaging hole 33Ld into which the support shaft 34Lis inserted along a direction parallel to the flat plate surface thereofand perpendicular to the longitudinal direction, at the middle positionin the longitudinal direction of the surface of the back plate 33Lcwhich is opposite side of the top plate 33La and the bottom plate 33Lb.That is, the wheel support 33L, the steering rotating body 32L and thefront wheel 22L can rotate around the support shaft 34L which isinserted into the engaging hole 33Ld as a center with respect to thevehicle body 90.

Both end portions of the support shaft 34L are held by the two rotationsupport portions 35L, 36L which are fixed to be arranged in parallelalong the Y axis direction with a predetermined space therebetween, atthe lower portion of the left side surface. Accordingly, the wheelsupport 33L is arranged along the Y axis direction and is supported bythe support shaft 34 to be rotatable around this direction as a centerwith respect to the vehicle body 90.

The space between the two rotation support portions 35L, 36L is set tobe larger than the width of the wheel support 33L in the Y axisdirection, and the cylindrical spacer 37L is inserted in the clearance.

FIG. 1 shows a state where the spacer 37L is arranged on the front sideof the wheel support 33L, and FIG. 3 shows a state where the spacer 37Lis arranged on the back side of the wheel support 33L.

The support shaft 34L functions as a guide to move the wheel support 33Lalong the Y axis direction, so that the position adjustment of the wheelsupport 33L in the Y axis direction can be made.

The spacer 37L can selectively be arranged on either the front side orthe back side of the wheel support 33L to function as a holding sectionto hold the wheel support 33L at the adjustment position in the Y axisdirection. That is, by changing the arrangement of the spacer 37L, theposition of the wheel support 33L in the Y axis direction can beadjusted within the range between the rotation support portions 35L,36L.

As above, the arrangement of each of the wheel supports 33R, 33L can bechanged, so that even if wheel base is different when attaching varioustypes of vehicle body covers with various designs to the vehicle body90, the arrangement of front wheels 22R, 22L can be appropriatelyadjusted.

With regard to the spacer 37L, in addition to changing the arrangementthereof, a plurality of the spacers with different thickness may beprepared to adjust the position of the wheel supports 33R, 33L and thefront wheels 22R, 22L in the Y axis direction by arranging the spacerson back and front sides of the wheel supports 33R, 33L, or laminatingand arranging a plurality of thinner spacers on back and front sides ofthe-wheel supports 33R, 33L.

The peripheries of the engaging hole 33Ld of the wheel support 33L andthe hole in the spacer 37L are continuously connected, however, a partof the periphery of the hole may be cut to have a C shape in crosssection, and the wheel support 33L and the spacer 37L may be made ofmaterial with flexibility. Thus, the wheel support 33L and the spacer37L can be easily attach to the support shaft 34L which has already beenattached to the rotation support portions 35L, 36L by pressing the Cshaped cut portion therein.

A facing plate 33Le is integrally provided to stand on the upper surfaceof the top plate 33La of the wheel support 33L to be parallel to theflat plate surface of the back plate 33Lc. The facing plate 33Le isadapted to receive an elastic force in the reacting direction withrespect to the vehicle body 90 from the suspension member 38L supportedon the left side surface of the vehicle body 90. On the facing plate33Le, a recess portion 33Lf with round shape to freely engage thesemispherical projecting portion 38Lc provided on the suspension member38L is formed on the facing surface of the vehicle body 90 side.

FIG. 5 is a front view of the running toy 100, and FIGS. 6 and 7 areplan views of a main portion of the suspension member 38L.

The suspension member 38L comprises a rectangular plate like baseportion 38La supported by the suspension holding portion 39L, a platespring 38Lb which is made of elastic material and extends along the Yaxis direction from the base portion 38La in a cantilevered state, andthe semispherical projecting portion 38Lc provided at the extending tipportion side of the plate spring 38Lb. The suspension member 38L givesthe elastic force to the wheel support 33L in a state where theprojecting portion 38Lc of the suspension member 38L engages the roundshaped recess portion 33Lf provided at the facing plate 33Le.

As shown in FIG. 5, when each of the front wheels 22R, 22L contacts theground, the upper portions of the wheel supports 33R, 33L rotate in adirection to come close to the side surface of the vehicle body 90around the support shafts 34R, 34L as a center by the weight of therunning toy 100, respectively, because the front wheels 22R, 22L arepositioned on the outer side of the support shafts 34R, 34L in the widthdirection of the vehicle body 90 (X axis direction), respectively.

Thus, the front wheels 22R, 22L, and the wheel supports 33R, 33L becomethe state of inclining to be a truncated chevron shaped when viewed fromthe front. Therefore, the facing plates 33Re, 33Le provided on the upperside of the wheel supports 33R, 33L move to a direction to come close tothe side surface of the vehicle body 90. However, since the suspensionmembers 38R, 38L which cause a reaction force in a direction to separatefrom the side surfaces are provided on the side surfaces of the vehiclebody 90, the wheel supports 33R, 33L are pushed back by the elasticforce of the suspension members 38R, 38L through the facing plates 33Re,33Le. Thereby, the vibration which the front wheels 22R, 22L receivesfrom the ground can be reduced by the suspension members 38R, 38L toobtain buffer effect while maintaining a state where the right and leftfront wheels 22R, 22L are inclined to each other to be the truncatedchevron shaped.

The front wheels 22R, 22L as a steering wheel maintain the inclinedstate to widen downward, so that the straight ahead steering state canbe maintained when an external force is not given (steering operation bythe steering mechanism 60 is not performed).

As described above, the position adjustment of the wheel supports 33R,33L can be performed in the back and forth direction with respect to thevehicle body 90. Therefore, the position adjustment of the suspensionmembers 38R, 38L also need to be performed in the back and forthdirection with respect to the vehicle body 90. Accordingly, as shown inFIGS. 5 and 7, the suspension holding portion 39L (same in the 39R)supports the long base portion of the suspension member 38L to beslidable along the Y axis direction. Thereby, the suspension member 38Lis moved to be adjusted in the same way as the recess portion 33Lfprovided in the facing plate 33Le of the wheel support 33L which wasmoved in the Y axis direction and adjusted, and the projecting portion38Lc thereof can engage the recess portion 33Lf. Thus, even when theposition adjustment of the front wheels 22R, 22L in the back and forthdirection was performed, it is possible to maintain a certain buffereffect.

As described above, in the front wheel support mechanisms 30R, 30L, thesuspension members 38R, 38L are provided on the side surface sides ofthe vehicle body 90 to face the facing plates 33Re, 33Le provided on theupper portion of the wheel supports 33R, 33L, respectively. Thus, theelastic reaction force acts in the state where the front wheels 22R,22L, and the wheel supports 33R, 33L that are pivotally supported aroundthe Y axis direction as a center are inclined to widen downward to be atruncated chevron shaped, so that vibration or impact to the vehiclebody 90 caused due to the road surface condition can be reduced.

In the front wheel support mechanisms 30R, 30L, the wheel support 33R,33L are pivotally supported by the support shafts 34R, 34L and areslidable with respect to the support shafts 34R, 34L, respectively, sothat the positions of the wheel supports 33R, 33L are decided by thespacers 37R and 37L. Thus, the adjustment of the wheel base can beperformed only by a minor change of a part of the structure, which isdifferent from the structure to extend or shorten the whole vehiclebody. Accordingly, the structure of adjustment can be simple, and theadjustment work can be performed easily and in a shorter time.

Further, the structure is such that the adjustment of the wheel supports33R, 33L in the back and forth direction is performed by separating themfrom the vehicle body, and also they are members mainly for supportingonly the front wheels 22R, 22L, and the steering rotating bodies 32R,32L, so that the size thereof can be small, and there is no need toconsider the arrangements of various components stored in the vehiclebody and impairing the function thereof as a conventional one whenmoving and adjusting the wheel supports 33R, 33L, enabling to adjust thewheel base with simple structure.

Since reduction in size and weight of the wheel supports 33R, 33L iseasy, distortion due to the lack of strength is hard to occur, thusfavorable running condition can be maintained.

Further, such as the ring-shaped portions 69Rc, 69Lc comprising the longhole, the steering arm 69 of the steering mechanism 60 comprises thestructure in which locomotive faculty can be transmitted in the rightand left direction even if change of the positions of the steeringrotating bodies 32R, 32L in the back and forth direction occur, so thatthe position adjustment of the front wheels 22R, 22L in the back andforth direction is not interrupted, and steering can be stablyperformed.

The suspension members 38R, 38L are supported by the suspension holdingportions 39R, 39L to be movable in the back and forth direction toadjust the positions, so that the elastic force can be given to thedirection to separate from the vehicle body 90 even when the change ofthe positions of the wheel supports 33R, 33L in the back and forthdirection occurs. Thus, stable buffer effect can be obtainedirrespective of the adjustment of the position of the front wheels 22R,22L in the back and forth direction.

Further, even when the front wheels 22R, 22L are moved and adjusted, itcan easily be dealt with only by the sliding operation without a need todo complicated reassembling work of the suspension members 38R, 38L,enabling to perform the work easily and in a shorter time.

(Modified Example of Front Wheel Support Mechanism)

In the above steering mechanism 60, the structure is such that the racktooth is formed on the steering arm 69, and the steering arm 69 is movedin the X axis direction by the pinion gear 64 which is driven to rotateby the DC motor for steering 13, however, it is not limited thereto. Anymethod to give locomotive faculty to the steering arm 69 when necessarymay be applied. For example, a structure in which an electromagnet and amagnetic material or a permanent magnet are used such as a solenoid or alinear motor, or a structure in which an arm is provided on an outputshaft of a rotary motor in the radial direction and the steering arm 69is moved from side to side by the rotation of the arm may be applied.

The engagement of the steering arm 69 and the steering rotating bodies32R, 32L is made by coupling the ring-shaped portions 69Rc, 69Lc eachhaving the long hole and the engaging protrusions 32Rc, 32Lc, however,any structure may be applied as long as they move in conjunction witheach other in the X axis direction while allowing the relative movementoccurring between them in the Y axis direction. For example, the longhole and the round bar like protrusion may be provided in the oppositeside each other, or a groove may be used instead of the long hole. Aslider to move along the extending direction of the driving arm or thedriven arm may be provided to one of them, and the other thereof may beconnected to the slider to be rotatable around the Z axis direction as acenter.

The front wheel support mechanisms 30L, 30R are not limited to the abovestructure, and any structure in which movement to adjust in the Y axisdirection is possible while allowing the rotation needed for steeringthe front wheels 22R, 22L may be applied. For example, the rotationsupport portions 35L, 36L may be provided to be movable along the Y axisdirection with respect to the vehicle body 90 to make the wheel support33L movable along the Y axis direction together with the support shaft34L. The rotation support portions 35L, 36L may have a relief structuresuch as a boss and a fitting hole to be attachable to or detachable fromthe vehicle body 90, and the position adjustment of the rotation supportportions 35L, 36L may be performed by providing a plurality of recessportions or projecting portions on the side surface side of vehicle bodyalong the Y axis direction. Moreover, at least two or more C rings maybe coaxially fixed to the wheel support 33L, the support shaft 34Lhaving a diameter larger than that of the C ring may be provided on therotation support portions 35L, 36L, and a plurality of circumferentialgrooves to rotatably attach the C ring along the longitudinal directionof the support shaft 34L may be formed on the outer periphery of thesupport shaft 34L. In this case, by selecting the circumferentialgrooves for the C rings and attaching the wheel support 33L, theposition adjustment of the wheel support 33L in the Y axis direction canbe achieved.

The same thing can be applied to the front wheel support mechanism 30R.

Although the suspension members 38R, 38L of the front wheel supportmechanisms 30R, 30L can be moved and adjusted in the Y axis direction bythe suspension holding portions 39R, 39L, any structure to elasticallygive buffer effect to the front wheels 22R, 22L irrespective of thechange of position even when the position adjustment of the front wheels22R, 22L in the back and forth direction was performed may be applied.

For example, the suspension member may be a long elastic body fixed tothe vehicle body 90 along the Y axis direction.

Further, a plurality of the suspension members may be fixed to thevehicle body 90 along the Y axis direction.

Further, the suspension member made of an elastic body contacting theside surface of the vehicle body 90 may be provided on each of thefacing plates 33Le and 33Re of the wheel supports 33R, 33L.

In these cases, when the position adjustment of the front wheels 22R and22L in the back and forth direction is performed, there is no need to dothe position adjustment of the suspension members. The elastic force isgiven to the wheel supports 33R, 33L from the suspension members, sothat buffer effect to the front wheel 22R, 22L can be maintained. Inthese cases, the suspension holding portions 39R, 39L can be eliminated.

(Steering Mechanism)

The vehicle body 90 comprises a motor and mechanism storing portion 61in which a motor and mechanism storing room is provided. The DC motorfor steering 13 is provided in the motor and mechanism storing room. Acover to cover the upper, side of the motor and mechanism storing roomis detachably attached to the vehicle body 90. The motor storing roomand the mechanism storing room may be divided, and separate covers maybe provided to cover the motor storing room and the mechanism storingroom.

As the DC motor for steering 13, a motor which can perform normalrotation and reverse rotation (normal and reverse rotations) can beused. The DC motor for steering 13 is mounted in the motor and mechanismstoring room so that a shaft 13 a thereof projects backward of thevehicle body 90 from the motor case. As shown in FIGS. 8A and 8B, theshaft 13 a is provided with the gear (pinion gear) 64 through the clutchmechanism 63. The clutch mechanism 63 comprises a disk (holding plate)63 a, clutch pieces 63 b and an external cylinder 63 c. That is, thedisk 63 a is fixed to the shaft 13 a. The shape of this disk 63 a is notspecifically limited to the disk shape. The plurality of the clutchpieces 63 b are provided on the end surface of the disk 63 a. Eachclutch piece 63 b is attached to the disk 63 a to be movable in theradial direction of the shaft 13 a. That is, guides 63 d approximatelyradially extending from the rotation center of the disk 63 a are formedon the disk 63 a, and each clutch piece 63 b is movable in the radialdirection of the shaft 13 a along the guides 63 d. Each guide 63 d isformed so that at least the outer end side thereof is formed to have abar shape. When the disk 63 a rotates, each clutch piece 63 b is adaptedto move outward in the radial direction of the shaft 13 a by acentrifugal force acting thereto.

On the other hand, the external cylinder 63 c has a peripheral wall tosurround the disk 63 a and the guides 63 d from the outside in theradial direction of the shaft 13 a. When the disk 63 a is rotated by thepower of the DC motor for steering 13, each clutch piece 63 b is movedoutward in the radial direction of the shaft 13 a by the centrifugalforce acting on thereon. Thus, each clutch piece 63 b is pressed to theinner surface of the peripheral wall of the external cylinder 63 c, sothat the disk 63 a and the external cylinder 63 c integrally rotate. Inthe state where the disk 63 a is not rotated, the external cylinder 63 ccan rotate freely with respect to the disk 63 a.

The pinion gear 64 meshes the rack tooth 69 d formed on the steering arm69. Consequently, when the pinion gear 64 is rotated in the normal orthe reverse direction by the power of the DC motor for steering 13, thesteering arm 69 moves from side to side corresponding to the rotationdirection thereof.

(Direct Current Motor for Running)

Provided at the rear portion of the vehicle body 90 is a motor andmechanism storing portion 71, the inside of which is divided into amotor storing room 71 a and a mechanism storing room 71 b as shown inFIG. 9.

As the DC motor for running 4, a motor which can perform normal rotationand reverse rotation (normal and reverse rotations) can be used. The DCmotor for running 4 is mounted in the motor storing room 71 a so that ashaft 4 a thereof projects toward the width direction of the vehiclebody 90 from a motor case 4 b. The shaft 4 a is provided with a gear(pinion gear) 81 a. The gear 81 a is provided at the position to be inthe mechanism storing room 71 b when the main body of the DC motor forrunning 4 is mounted in the motor storing room 71 a. Two terminals 4 c,4 d are provided on the outer periphery of the motor case 4 b of the DCmotor for running 4.

The floor of the motor storing room 71 a is formed with a printed wiringboard 74. Electrode patterns 74 a, 74 b are formed on the surface of theprinted wiring board 74 to correspond to the terminals 4 c, 4 d. Theelectrode patterns 74 a, 74 b are formed by printing or vapordeposition.

When the DC motor for running 4 is mounted on the printed wiring board74, the terminals 4 c, 4 d are electrically connected to the electrodepatterns 74 a, 74 b, thereby supplying electricity to the DC motor forrunning 4.

The printed wiring board 74 may have a plate like shape, or may becurved to be concave upward. That is, it is only necessary that theprinted wiring board 74 is formed to correspond to the shape of themotor case 4 b and the terminals 4 c, 4 d certainly contact theelectrode patterns 74 a, 74 b.

According to the running toy 100 having the above structure, since theprinted wiring board 74 on which the electrode patterns 74 a, 74 b areformed is used, the assembly of the running toy 100 becomes extremelyeasy. That is, in the case of not using the printed wiring board 74,fine work such as assembling electrode plates (conductive plates) one byone on the vehicle body side, soldering of conducting wires forelectrical connection or the like is needed. On the other hand, whenusing the printed wiring board 74 on which the electrode patterns 74 a,74 b are formed, it is only necessary to assemble the printed wiringboard 74 to the vehicle body when assembling the running toy 100, sothat the assembly of the running toy 100 becomes extremely easy.

When electrically connecting the conducting wires in the case of usingthe conductive wires, there is a possibility to make a mistake inwiring, however, in this embodiment, there is no need to consider suchmistake because the terminals are electrically connected only bycontacting the electrode patterns 74 a, 74 b.

(Running Mechanism)

The running mechanism 80 for transmitting the running torque of the DCmotor for running 4 to the rear wheels 21R, 21R is provided in themechanism storing room 71 b. The running mechanism 80 comprises a gearmechanism 81 having the gear 81 a.

That is, a shaft 82 parallel to the shaft 4 a extends in the mechanismstoring room 71 b. As shown in FIG. 1, a gear 81 b is provided on theshaft 82 to be freely rotatable with respect to the shaft 82. The gear81 b can move in the axis direction of the shaft 82. Gears 81Rc, 81Lcare integrally provided on the shaft 82 on the right and left sides ofthe gear 81 b.

A shaft (rear wheel axle) 83 parallel to the shaft 82 extends in themechanism storing room 71 b. Gears 81Rd, 81Ld are fixed to the shaft 83.When the gear 81 b moves in the axis direction of the shaft 82, thegears 81Rc, 81Lc alternately mesh the gears 81Rd, 81Ld corresponding tothe moving direction of the shaft 82. Specifically, when the gear 81 bmoves to the left in the axis direction of the shaft 82, the gear 81Lcmeshes the gear 81Ld, and when the gear 81 b moves to the right in theaxis direction of the shaft 82, the gear 81Rc meshes the gear 81Rd. Bychanging the meshing state of the gears, the running torque can bechanged.

For moving the gear 81 b in the axis direction of the shaft 82, a notshown operation control is attached on the lower side of the vehiclebody 90. A lever 84 is moved to left or right by the operation of theoperation control, so that the gear 81 b between pawls 84 a and 84 b ofthe lever 84 is pushed to left or right to change the meshing state ofthe gears.

(Cover)

As shown in FIG. 9, a cover 91 to cover the upper side of the motorstoring room 71 a and the mechanism storing room 71 b is detachablyattached to the vehicle body 90. The cover 91 functions as a motorholding member. Separate covers may be provided to separately cover themotor storing room 71 a and the mechanism storing room 71 b from theupper side.

The cover 91 is provided with a plurality of heat radiation openings 91a and a slit 93 to attach a radiation plate 92. The radiation plate 92can be detached from the slit 93. For example, the radiation plate 92 ispreferably made of metal such as copper or aluminum, however, it may bemade of synthetic resin (for example, ABS resin) if selecting the shapewith high radiation effect.

According to the running toy 100 having the above structure, theradiation plate 92 can be replaced easily, thereby enabling to easilychange heat radiation performance. Moreover, the radiation plate 92 withdifferent weights can be used depending upon the road surface condition.Further, the radiation plate 92 with different colors or shapes can beused according to mood. To effectively exert above various effects, itis preferable to prepare a plurality of radiator plates which aredifferent in any of heat radiation property, weight, color and shape,and select a radiation plate among them to suit the need.

The number of the radiation plates 92 to be attached at the same time isnot limited to one. The structure may be such that two or more radiationplates 92 can be attached to the cover 91.

(Drive Circuit and Control Circuit)

The DC motor for running and the DC motor for steering are mounted onthe running toy, and the rotation direction of each motor is changed byremote control, that is by sending radio waves from a remote controldevice.

As shown in FIG. 11, a receiving circuit 1, a control IC 2, a runningmotor drive circuit 3 for driving the DC motor for running 4, and asteering motor drive circuit 8 for driving the DC motor for steering 13are contained in the running toy.

An operation signal radio wave transmitted from the not shown remotecontrol device is received by the receiving circuit 1 through theantenna and demodulated to be input to the control IC 2. The control IC2 transmits a control instruction signal corresponding to the operationsignal which was input to the control drive circuit of the runningsystem and/or the steering system.

For example, when the operation signal is the forward movementinstruction, the control IC 2 outputs the forward movement instructionsignal SF to the running motor drive circuit 3. The running motor drivecircuit 3 supplies voltage having a polarity corresponding to theforward movement direction to the DC motor for running 4. Similarly,when the operation signal is the backward movement instruction, thecontrol IC 2 outputs the backward movement instruction signal SB to therunning motor drive circuit 3. The running motor drive circuit 3supplies voltage having a polarity corresponding to the backwardmovement direction to the DC motor for running 4.

When the operation signal is the steering control signal for the rightturn instruction, the control IC 2 outputs the right turn instructionsignal SR to the steering motor drive circuit 8. The steering motordrive circuit 8 supplies voltage having a polarity corresponding to theright turn direction to the steering motor drive circuit 8. Similarly,when the operation signal is the left turn instruction, the control IC 2outputs the left turn instruction signal SL to the steering motor drivecircuit 8. The steering motor drive circuit 8 supplies voltage having apolarity corresponding to the left turn direction to the DC motor forsteering 13.

The steering motor drive circuit 8 comprises a positive power supplyterminal 14 and a negative power supply terminal 15 between which atleast two batteries 9, 10 can be connected in series.

A PNP transistor (first switching element) Q5 and a NPN transistor(second switching element) Q6 are connected in series between thepositive power supply terminal 14 to supply power supply voltage Vcc andthe negative power supply terminal 15 connected to the GND potential.The transistor Q5 and the transistor Q6 become conducting (ON) andnonconducting (OFF) alternately according to the left turn instructionsignal SL and the right turn instruction signal SR from the control IC2.

The DC motor for steering 13 is connected between a junction point 16 ofthe batteries 9, 10 and a junction point 17 of the transistor Q5 and thetransistor Q6.

The rotary shaft of the DC motor for steering 13 is connected to thesteering mechanism 60 connected to the steering wheels (front wheels).By changing the rotation direction of the DC motor for steering 13, thedirection of the steering wheels can be changed through the steeringmechanism 60.

As shown in FIG. 12, a self-holding type power supply switch 18 isprovided at the junction point of the batteries 9, 10. The power supplyswitch 18 is for electrically connecting a terminal on one side of theDC motor for steering 13, a negative side terminal 16A of the battery 9,and a positive side terminal 16B of the battery 10 when the power is on.

When the power supply switch 18 is on, the negative side of the battery9 and the positive side of the battery 10 are electrically connected,and one terminal of the DC motor for steering 13 is connected to thepower supply switch 18, so that the power supply voltage Vcc of the twoseries-connected batteries (for example, 1.5V×2=3V) is supplied to eachcircuit 1, 2, 3, 8, and a current path of an armature of the DC motorfor steering 13 is formed.

Although the power supply voltage Vcc (for example, 3V) is appliedbetween both ends of the steering motor drive circuit 8, the voltageapplied to the DC motor for steering 13 in each rotation directionthereof is ½ of the power supply voltage Vcc (1.5V) because the batteryto be used is different depending upon a loop L1 and a loop L2 to bedescribed later.

(Circuit Operation)

When the power supply switch 18 (FIG. 12) is on, the batteries 9, 10 areconnected in series via the negative side terminal 16A and the positiveside terminal 16B, and the DC motor for steering 13 is connected to thejunction point 16 (FIG. 11) of the batteries 9, 10. At this time, twoloops are formed in the steering motor drive circuit 8.

As shown in FIG. 11, one is the loop L1, that is, battery 9

positive power supply terminal 14

transistor Q5

junction point 17

DC motor for steering 13

junction point 16

battery 9.

Another one is the loop L2, that is, battery 10

junction point 16

DC motor for steering 13

junction point 17

transistor Q6

negative power supply terminal 15

battery 10.

Now, when the left turn instruction signal SL “potential L” is appliedfrom the control IC 2, the transistor Q5 is on, the current flows in thepath of the loop L1, and the DC motor for steering 13 rotates to leftcorresponding to the current direction thereof. On the other hand, whenthe right turn instruction signal SR “potential H” is applied from thecontrol IC 2, the transistor Q6 is on, the current flows in the path ofthe loop L2 which is reverse direction in the case of the loop L1, andthe DC motor for steering 13 rotates to right corresponding to thecurrent direction thereof.

As above, the transistors Q5 and Q6 alternately perform ON/OFF operationin a complementary style. With the ON/OFF operation, the direction ofthe armature current flowing in the DC motor for steering 13 is reveredto control the running direction of the running toy.

When running a plurality of the running toys 100 at the same time, theoperating frequency to operate each running toy 100 is made different.In this case, it is needed to select and supply a remote controllerwhich accords with each operating frequency of the running toy side.Therefore, to make the selection of a pair of the running toy 100 andthe corresponding remote controller easy, it is preferable to change thecolor of the conductive wire for antenna depending upon the operatingfrequency.

The entire disclosure of Japanese Patent Application No. Tokugan2004-299032 which was filed on Oct. 13, 2004, including specification,claims, drawings and summary are incorporated herein by reference in itsentirety.

1. A running toy comprising: a direct current motor for steering whichis remote controlled; and a steering arm to change a direction of awheel, the steering arm being operated from side to side with respect toa vehicle body by a power of the direct current motor for steering,wherein a rack tooth is formed on the steering arm, the direct currentmotor for steering is allowed to perform a normal rotation and a reverserotation, and a pinion gear which meshes the rack tooth is attached to ashaft of the direct current motor for steering via a centrifugal clutch.2. The running toy as claimed in claim 1, wherein the wheel and thedirect current motor for steering are provided at a position in front ofa position of the steering arm in the vehicle body.
 3. The running toyas claimed in claim 1, wherein a spring to return the steering arm to aneutral position in a lateral direction of the vehicle body in a statewhere the direct current motor for steering is not operated, isprovided.
 4. The running toy as claimed in claim 2, wherein a spring toreturn the steering arm to a neutral position in a lateral direction ofthe vehicle body in a state where the direct current motor for steeringis not operated is provided.
 5. The running toy as claimed in claim 1,wherein the pinion gear is provided coaxial to the shaft, thecentrifugal clutch is attached to the shaft, and when the centrifugalclutch is operated in a radial direction by a rotation of the directcurrent motor for steering, the centrifugal clutch is pressed on thepinion gear to rotate the pinion gear together with the shaft.